php - mysql_num_fields() : supplied argument is not a valid MySQL result resource with timestamp greater than

Question

mysql正在输出这个错误

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '=> '0000-00-01'' at line 1

这是我的代码

 foreach($tables as $table)
  {
    //SELECT Everything from the table in use
    $sql = "SELECT * FROM `".$table."` WHERE `timestamp` => '".$offline_time."'";
    $result = mysql_query($sql);
    echo mysql_error();
    //Return Number of fields/colulms in the table.
    $num_fields = mysql_num_fields($result);

Answer 1

我假设你的意思是 >= 而不是 => for "equal or greater too"